Pressure protection method, device and equipment for air conditioning system of commercial vehicle and medium

Abstract

The invention discloses a commercial vehicle air conditioner system pressure protection method, device and equipment and a medium, and the method comprises the steps that an air conditioner is controlled to enter or exit an air conditioner protection state based on preset air conditioner pressure protection logic; wherein the air conditioner protection state comprises a high-voltage protection state, a low-voltage protection state and a medium-voltage protection state; the method can replace an existing commercial vehicle air-conditioning system pressure protection scheme which depends on empirical values and does not have air-conditioning system and refrigerant parameter correction, and at main working condition points of high-pressure protection, medium-pressure protection, low-pressure protection and protection quitting of the air-conditioning system, the corresponding phase-change pressure of the refrigerant is calculated by setting the allowable phase-change temperature of the refrigerant, so that the protection precision of the air-conditioning system is improved. Therefore, all pressure parameters of pressure protection of the air conditioning system are determined, the accuracy and reliability of pressure protection logic of the air conditioning system are improved, and the requirement for pressure protection of the air conditioning system of a commercial vehicle using different parts and refrigerants can be met.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle air conditioning pressure protection, and in particular to a commercial vehicle air conditioning system pressure protection method, device, equipment and medium. Background Art

[0002] The control logic of the commercial vehicle air conditioning system can not only affect the user's driving comfort, but also the vehicle's energy consumption. In addition to affecting comfort and energy consumption, the control logic of the air conditioning system is also a guarantee of the reliability of the air conditioning system and an important part of vehicle design. At present, the pressure protection logic of the traditional commercial vehicle air conditioning system is still based on the empirical value suitable for traditional refrigerants, and cannot flexibly respond to the needs of new refrigerants and new system components.

[0003] However, at this stage, due to the need to control greenhouse gas emissions, many commonly used air conditioning refrigerants are about to be phased out. The physical properties of the new generation of refrigerants are significantly different from those of traditional refrigerants, and the empirical values ​​applicable to traditional refrigerants are obviously inappropriate. At the same time, the new generation of refrigerants to be used also have flammable or high-pressure problems, so the air conditioning system architecture also needs to change significantly, which further leads to the distortion of the empirical values ​​based on traditional refrigerants and traditional commercial vehicle air conditioning systems. Therefore, a pressure protection logic for commercial vehicle air conditioning systems is urgently needed to meet the needs of different refrigerants and air conditioning system structures. Summary of the invention

[0004] The present application provides a commercial vehicle air conditioning system pressure protection method, device, equipment and medium to solve the above-mentioned problems.

[0005] On the one hand, the present application provides a commercial vehicle air conditioning system pressure protection method, the method comprising: based on a preset air conditioning pressure protection logic, controlling the air conditioner to enter or exit an air conditioning protection state; wherein the air conditioning protection state includes a high pressure protection state, a low pressure protection state, and a medium pressure protection state; the air conditioning pressure protection logic is specifically:

[0006] When the high pressure of the refrigerant inside the air conditioner is higher than the first pressure threshold that the air conditioning system components can withstand, the air conditioner enters the high pressure protection state; when the high pressure of the refrigerant inside the air conditioner is within the range that can ensure heat dissipation when the original vehicle cooling fan is fully engaged, the air conditioner exits the high pressure protection state;

[0007] When the low pressure of the refrigerant inside the air conditioner is lower than the second pressure threshold of the air conditioning system's icing protection, the air conditioner enters the low pressure protection state; when the low pressure of the refrigerant inside the air conditioner is higher than the second pressure threshold of the air conditioning system's icing protection, the air conditioner exits the low pressure protection state;

[0008] When the high pressure of the refrigerant inside the air conditioner is higher than the third pressure threshold of the stable operation of the air conditioning system, but is still within the range where the original vehicle's cooling fan is fully engaged to ensure heat dissipation, the air conditioner enters the medium pressure protection state; when the high pressure of the refrigerant inside the air conditioner reaches the fourth pressure threshold of the air conditioning system charge calibration test, the air conditioner exits the medium pressure protection state.

[0009] In one implementation of the present application, the method further includes:

[0010] Set the air conditioning medium pressure protection exit pressure P0, air conditioning medium pressure protection pressure P1, air conditioning high pressure protection exit pressure P2, air conditioning high pressure protection pressure P3, air conditioning low pressure protection exit pressure P4, and air conditioning low pressure protection pressure P5, air conditioning system high pressure P h ;

[0011] When P1<P h <P2, the air conditioner enters the medium pressure protection state; when P h When P<P0, the air conditioner exits the medium pressure protection state; when P h >P3, the air conditioner enters high pressure protection state; when P h <P2, the air conditioner exits the high pressure protection state; when P l <P5, the air conditioner enters low pressure protection state; when P l >P4, the air conditioner exits the low-pressure protection state.

[0012] In one implementation of the present application, the method further includes:

[0013] When the air conditioner enters the high-voltage protection state, the original car air conditioner will not start; when the air conditioner exits the high-voltage protection state, the original car air conditioner is allowed to start;

[0014] When the air conditioner enters the low-voltage protection state, the original car air conditioner will not start; when the air conditioner exits the low-voltage protection state, the original car air conditioner is allowed to start;

[0015] When the air conditioner enters the medium-voltage protection state, the original vehicle cooling fan is fully engaged; when the air conditioner exits the medium-voltage protection state, the original vehicle cooling fan returns to the state required by the cooling system.

[0016] In one implementation of the present application, the method further includes:

[0017] When P0≤P h ≤P1, the air conditioner maintains the medium voltage protection state;

[0018] When P2≤P h ≤P0, the air conditioner maintains high pressure protection state;

[0019] When P5≤P l ≤P4, the air conditioner maintains low pressure protection status.

[0020] In one implementation of the present application, for the air conditioner high pressure protection, the value of the pressure protection pressure P3 is determined by the lowest withstand pressure value of each component of the air conditioning system; the value of the air conditioner high pressure protection exit pressure P2 is determined by the refrigerant phase change temperature T2 inside the condenser when the high pressure protection is no longer needed; wherein, the stable operation of the air conditioner condenser refrigerant phase change temperature and the test environment temperature T2 are defined when the original vehicle cooling fan is fully engaged. t The difference is ΔT2, then T2 is the instantaneous maximum ambient temperature T of the area where the air-conditioning user's car is located. h and ΔT2, that is, T2 = T h +ΔT2; P2 is the phase change pressure when the refrigerant temperature of the commercial vehicle air conditioner is T2 minus the pressure fluctuation value P w .

[0021] In one implementation of the present application, for the low-pressure protection of the air conditioner: the value of the low-pressure protection pressure P5 of the air conditioner is determined by the set temperature T5 of the icing protection; P5 is the phase change pressure when the refrigerant temperature of the commercial vehicle air conditioner is actually used at T5; the low-pressure protection exit pressure P4 is determined by the exit temperature T4 of the icing protection, and T4 is the product of T5 and the temperature fluctuation value T w The sum of T4 = T5 + T w ; P4 is the phase change pressure when the refrigerant temperature actually used by the commercial vehicle air conditioner is T4.

[0022] In one implementation of the present application, for the medium-pressure protection of the air conditioner: the value of the medium-pressure protection pressure P1 is determined by the phase change temperature T1 of the refrigerant inside the condenser when the medium-pressure protection is required; the phase change temperature of the refrigerant in the air conditioner condenser in stable operation when the original vehicle cooling fan is not engaged is defined as the phase change temperature of the refrigerant in the air conditioner condenser in stable operation and the test environment temperature T t The difference is ΔT1, then T1 is T h and ΔT1, that is, T1=T h +ΔT1; P1 is the phase change pressure when the refrigerant temperature of the commercial vehicle air conditioner is T1; the medium pressure protection exit pressure P0 is the high pressure value P of the commercial vehicle air conditioner system in stable operation n and pressure fluctuation value P w The sum of P0 = P n +P w ;P n That is, the high pressure value when the commercial vehicle air conditioner is operating within the standard charging amount range and charging temperature.

[0023] The present application also provides a pressure protection device for a commercial vehicle air conditioning system, the device comprising:

[0024] A control module, used to control the air conditioner to enter or exit an air conditioner protection state based on a preset air conditioner pressure protection logic; wherein the air conditioner protection state includes a high pressure protection state, a low pressure protection state and a medium pressure protection state;

[0025] The high-pressure protection module is used to enter the high-pressure protection state when the high pressure of the refrigerant inside the air conditioner is higher than the first pressure threshold tolerated by the air-conditioning system components; the air conditioner exits the high-pressure protection state when the high pressure of the refrigerant inside the air conditioner is within the range that can ensure heat dissipation when the original vehicle cooling fan is fully engaged;

[0026] The low-pressure protection module is used to make the air conditioner enter the low-pressure protection state when the low pressure of the refrigerant inside the air conditioner is lower than the second pressure threshold of the air conditioner system ice protection; when the low pressure of the refrigerant inside the air conditioner is higher than the second pressure threshold of the air conditioner system ice protection, the air conditioner exits the low-pressure protection state;

[0027] The medium-pressure protection module is used to prevent the air conditioner from entering the medium-pressure protection state when the high pressure of the refrigerant inside the air conditioner is higher than the third pressure threshold of the stable operation of the air-conditioning system, but is still within the range where the original vehicle cooling fan is fully engaged to ensure heat dissipation; and when the high pressure of the refrigerant inside the air conditioner reaches the fourth pressure threshold of the air-conditioning system charge calibration test, the air conditioner exits the medium-pressure protection state.

[0028] The present application also provides a pressure protection device for a commercial vehicle air conditioning system, the device comprising:

[0029] at least one processor; and,

[0030] a memory communicatively connected to the at least one processor; wherein,

[0031] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can complete the aforementioned commercial vehicle air conditioning system pressure protection method.

[0032] The present application also provides a non-volatile computer storage medium for pressure protection of a commercial vehicle air-conditioning system, which stores computer executable instructions. The computer executable instructions are executed by a processor to implement the aforementioned commercial vehicle air-conditioning system pressure protection method.

[0033] The present application provides a commercial vehicle air-conditioning system pressure protection method, system, equipment and medium, which can replace the current commercial vehicle air-conditioning system pressure protection scheme that relies on empirical values ​​and has no air-conditioning system and refrigerant parameter correction. At the main operating points of high-pressure protection, medium-pressure protection, low-pressure protection and exit protection of the air-conditioning system, by setting the allowable phase change temperature of the refrigerant, the corresponding phase change pressure of the refrigerant is calculated, thereby determining the various pressure parameters of the air-conditioning system pressure protection, improving the accuracy and reliability of the air-conditioning system pressure protection logic, and also meeting the pressure protection needs of commercial vehicle air-conditioning systems using different components and refrigerants. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0035] Figure 1 A flow chart of a pressure protection method for a commercial vehicle air conditioning system provided in an embodiment of the present application;

[0036] Figure 2 A composition diagram of a pressure protection device for a commercial vehicle air conditioning system provided in an embodiment of the present application;

[0037] Figure 3 A schematic diagram of a pressure protection device for a commercial vehicle air conditioning system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0039] The embodiments of the present application provide a method, device, equipment and medium for pressure protection of a commercial vehicle air conditioning system. The technical solution proposed in the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0040] Embodiment 1

[0041] Figure 1 A commercial vehicle air conditioning system pressure protection method is provided in an embodiment of the present application. Figure 1As shown, the method mainly includes the following steps: based on a preset air conditioning pressure protection logic, controlling the air conditioning to enter or exit the air conditioning protection state; wherein the air conditioning protection state includes a high pressure protection state, a low pressure protection state and a medium pressure protection state; the air conditioning pressure protection logic is specifically:

[0042] When the high pressure of the refrigerant inside the air conditioner is higher than the first pressure threshold that the air conditioning system components can withstand, the air conditioner enters the high pressure protection state; when the high pressure of the refrigerant inside the air conditioner is within the range that can ensure heat dissipation when the original vehicle cooling fan is fully engaged, the air conditioner exits the high pressure protection state;

[0043] When the low pressure of the refrigerant inside the air conditioner is lower than the second pressure threshold of the air conditioning system's icing protection, the air conditioner enters the low pressure protection state; when the low pressure of the refrigerant inside the air conditioner is higher than the second pressure threshold of the air conditioning system's icing protection, the air conditioner exits the low pressure protection state;

[0044] When the high pressure of the refrigerant inside the air conditioner is higher than the third pressure threshold of the stable operation of the air conditioning system, but is still within the range where the original vehicle's cooling fan is fully engaged to ensure heat dissipation, the air conditioner enters the medium pressure protection state; when the high pressure of the refrigerant inside the air conditioner reaches the fourth pressure threshold of the air conditioning system charge calibration test, the air conditioner exits the medium pressure protection state.

[0045] This application sets the air conditioning medium pressure protection exit pressure P0, the air conditioning medium pressure protection pressure P1, the air conditioning high pressure protection exit pressure P2, the air conditioning high pressure protection pressure P3, the air conditioning low pressure protection exit pressure P4, and the air conditioning low pressure protection pressure P5.

[0046] When the high pressure Ph of the air conditioning system is between P1 and P2, that is, P1<Ph<P2, the air conditioning enters the medium pressure protection state.

[0047] When the system high pressure Ph is between the air conditioner medium pressure protection pressure P1 and the medium pressure protection exit pressure P0, that is, P0≤Ph≤P1, the air conditioner maintains the previous state.

[0048] When the high pressure Ph of the air conditioning system is less than P0, the air conditioning exits the medium pressure protection state.

[0049] When the high pressure Ph of the air conditioning system is higher than the high pressure protection pressure, that is, Ph>P3, the air conditioning enters the high pressure protection state.

[0050] When the system high pressure Ph is between the air conditioner high pressure protection pressure P3 and the high pressure protection exit pressure P2, that is, P2≤Ph≤P0, the air conditioner maintains the previous state.

[0051] When the high pressure Ph of the air conditioning system is lower than the high pressure protection exit pressure, that is, Ph<P2, the air conditioning exits the high pressure protection state.

[0052] When the low pressure Pl of the air conditioning system is lower than the low pressure protection pressure, that is, Pl<P5, the air conditioning enters the low pressure protection state.

[0053] When the system low pressure Pl is between the air conditioner low pressure protection pressure P5 and the low pressure protection exit pressure P4, that is, P5≤Pl≤P4, the air conditioner maintains the previous state.

[0054] When the air conditioning system low pressure Pl is higher than the low pressure protection exit pressure, that is, Pl>P4, the air conditioning exits the low pressure protection state.

[0055] The empirical values ​​and empirical formulas of the above protection pressure values ​​are as follows:

[0056] The value of the high-pressure protection pressure P3 is determined by the lowest pressure resistance value of each component of the air-conditioning system.

[0057] The value of the high-pressure protection exit pressure P2 is determined by the refrigerant phase change temperature T2 inside the condenser when high-pressure protection is no longer needed.

[0058] It is defined that when the original vehicle cooling fan is fully engaged, the difference between the refrigerant phase change temperature of the stably operating air-conditioning condenser and the test ambient temperature Tt is ΔT2, then T2 is the sum of the instantaneous maximum ambient temperature Th and ΔT2 in the area where the air-conditioning user's car is located, that is, T2 = Th + ΔT2.

[0059] P2 is the phase change pressure when the refrigerant temperature actually used by the commercial vehicle air conditioner is T2 minus the pressure fluctuation value Pw.

[0060] The value of the low pressure protection pressure P5 is determined by the set temperature T5 of the icing protection.

[0061] P5 is the phase change pressure when the refrigerant temperature actually used by the commercial vehicle air conditioner is T5.

[0062] The low pressure protection exit pressure P4 is determined by the exit temperature T4 of the icing protection. T4 is the sum of T5 and the temperature fluctuation value Tw, that is, T4=T5+Tw.

[0063] P4 is the phase change pressure when the refrigerant temperature actually used by the commercial vehicle air conditioner is T4.

[0064] The value of the medium-pressure protection pressure P1 is determined by the refrigerant phase change temperature T1 inside the condenser when medium-pressure protection is required.

[0065] It is defined that when the original vehicle cooling fan is not engaged, the difference between the refrigerant phase change temperature of the stably operating air-conditioning condenser and the test ambient temperature Tt is ΔT1, then T1 is the sum of Th and ΔT1, that is, T1=Th+ΔT1.

[0066] P1 is the phase change pressure when the refrigerant temperature actually used by the commercial vehicle air conditioner is T1.

[0067] The medium pressure protection exit pressure P0 is the sum of the stable operation high pressure value Pn and the pressure fluctuation value Pw of the commercial vehicle air-conditioning system, that is, P0 = Pn + Pw.

[0068] Pn is the high pressure value when the commercial vehicle air conditioner is operating within the standard charging amount range and charging temperature.

[0069] like Figure 1 As shown, this embodiment provides a low voltage protection logic for a commercial vehicle, including the following steps:

[0070] Determine whether commercial vehicles require low voltage protection;

[0071] After the air conditioner is turned on, if the low pressure Pl of the air conditioning system is not lower than the low pressure protection pressure P5, that is, Pl ≥ P5, the air conditioning system does not need low pressure protection, and the subsequent high pressure protection and medium pressure protection judgments are carried out;

[0072] If the low pressure Pl of the air conditioning system is lower than the low pressure protection pressure P5, that is, Pl<P5, the air conditioning enters the low pressure protection state and the air conditioning compressor does not start;

[0073] Furthermore, if the low pressure of the air conditioning system is still not higher than the low pressure protection exit pressure P4, that is, when Pl≤P4, the air conditioning continues to be in the low pressure protection state, and the air conditioning compressor does not start;

[0074] Furthermore, if the low pressure of the air-conditioning system is higher than the low pressure protection exit pressure P4, that is, Pl>P4, the air-conditioning system exits the low pressure protection state and performs subsequent high pressure protection and medium pressure protection judgments.

[0075] Embodiment 2

[0076] like Figure 1 As shown, this embodiment provides a commercial vehicle high voltage protection logic, including the following steps:

[0077] After the air conditioner is turned on, if the air conditioner system does not need low-pressure protection, high-pressure protection judgment is performed. If the high-pressure Ph is not higher than the high-pressure protection pressure P3, that is, Ph≤P3, the air conditioner does not need high-pressure protection, the air conditioner compressor is started, and the subsequent medium-pressure protection judgment is performed;

[0078] If the high pressure Ph of the air conditioning system is higher than the high pressure protection pressure P3, that is, Ph>P3, the air conditioning enters the high pressure protection state and the air conditioning compressor does not start;

[0079] Furthermore, if the high pressure of the air conditioning system is still not lower than the high pressure protection exit pressure P2, that is, when Ph≥P2, the air conditioning continues to be in the high pressure protection state, and the air conditioning compressor does not start;

[0080] Furthermore, if the high pressure of the air-conditioning system is lower than the high pressure protection exit pressure P2, that is, Ph<P2, the air-conditioning system exits the high pressure protection state, the air-conditioning compressor starts, and the subsequent medium pressure protection judgment is performed.

[0081] Embodiment 3

[0082] like Figure 1 As shown, this embodiment provides a medium voltage protection logic for a commercial vehicle, including the following steps:

[0083] After the air conditioner is turned on, if the air conditioner system does not need low-pressure and high-pressure protection, the medium-pressure protection judgment is performed. If the high-pressure Ph is not higher than the medium-pressure protection pressure P1, that is, Ph≤P1, the air conditioner does not need medium-pressure protection, and the original vehicle cooling fan does not need to be fully engaged;

[0084] If the high pressure Ph of the air conditioning system is higher than the medium pressure protection pressure P1, that is, Ph>P1, the air conditioning enters the medium pressure protection state, and the original vehicle cooling fan is fully engaged;

[0085] Furthermore, if the high pressure of the air conditioning system is still not lower than the medium pressure protection exit pressure P0, that is, when Ph≥P0, the air conditioning continues to be in the medium pressure protection state, and the original vehicle cooling fan is fully engaged;

[0086] Furthermore, if the high pressure of the air-conditioning system is lower than the medium pressure protection exit pressure P0, that is, Ph<P0, the air-conditioning system exits the medium pressure protection state, and the original vehicle cooling fan returns to the state required by the cooling system.

[0087] The above is a commercial vehicle air conditioning system pressure protection method provided by an embodiment of the present application. Based on the same inventive concept, an embodiment of the present application also provides a commercial vehicle air conditioning system pressure protection device. Figure 2 A composition diagram of a pressure protection device for a commercial vehicle air conditioning system provided in an embodiment of the present application, such as Figure 2As shown, the device mainly includes: a control module 201, which is used to control the air conditioner to enter or exit the air conditioner protection state based on a preset air conditioner pressure protection logic; wherein the air conditioner protection state includes a high-pressure protection state, a low-pressure protection state and a medium-pressure protection state; a high-pressure protection module 202, which is used to control the air conditioner to enter the high-pressure protection state when the high pressure of the refrigerant inside the air conditioner is higher than the first pressure threshold tolerated by the air conditioner system components; when the high pressure of the refrigerant inside the air conditioner is within the range that can ensure heat dissipation when the original vehicle cooling fan is fully engaged, the air conditioner exits the high-pressure protection state; a low-pressure protection module 203, which is used to control the air conditioner to enter or exit the high-pressure protection state when the high pressure of the refrigerant inside the air conditioner is higher than the first pressure threshold tolerated by the air conditioner system components; when the high pressure of the refrigerant inside the air conditioner is within the range that can ensure heat dissipation when the original vehicle cooling fan is fully engaged, the air conditioner exits the high-pressure protection state; When the low pressure of the internal refrigerant is lower than the second pressure threshold of the air-conditioning system's ice protection, the air-conditioning enters a low-pressure protection state; when the low pressure of the internal refrigerant of the air-conditioning is higher than the second pressure threshold of the air-conditioning system's ice protection, the air-conditioning exits the low-pressure protection state; the medium-pressure protection module 204 is used to control the air-conditioning to enter a medium-pressure protection state when the high pressure of the internal refrigerant of the air-conditioning is higher than the third pressure threshold of the air-conditioning system's stable operation, but still within the range where the original vehicle's cooling fan is fully engaged to ensure heat dissipation; when the high pressure of the internal refrigerant of the air-conditioning reaches the fourth pressure threshold of the air-conditioning system's charge calibration test, the air-conditioning exits the medium-pressure protection state.

[0088] The above is a commercial vehicle air conditioning system pressure protection device provided by the embodiment of the present application. Based on the same inventive concept, the embodiment of the present application also provides a commercial vehicle air conditioning system pressure protection device. Figure 3 A schematic diagram of a pressure protection device for a commercial vehicle air conditioning system provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, the device mainly includes: at least one processor 301; and a memory 302 that is communicatively connected to the at least one processor; wherein the memory 302 stores instructions that can be executed by the at least one processor 301, and the instructions are executed by the at least one processor 301 so that the at least one processor 301 can complete the aforementioned commercial vehicle air conditioning system pressure protection method.

[0089] In addition, an embodiment of the present application also provides a non-volatile computer storage medium for pressure protection of a commercial vehicle air-conditioning system, which stores computer executable instructions, and the computer executable instructions are executed by a processor to implement the aforementioned commercial vehicle air-conditioning system pressure protection method.

[0090] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0091] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0092] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0093] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0094] Each embodiment in this application is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0095] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0096] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A pressure protection method for a commercial vehicle air conditioning system, characterized in that: The method includes: based on a preset air conditioning pressure protection logic, controlling the air conditioning to enter or exit an air conditioning protection state; wherein the air conditioning protection state includes a high pressure protection state, a low pressure protection state, and a medium pressure protection state; the air conditioning pressure protection logic is specifically: When the high pressure of the refrigerant inside the air conditioner is higher than the first pressure threshold that the air conditioning system components can withstand, the air conditioner enters the high pressure protection state; when the high pressure of the refrigerant inside the air conditioner is within the range that can ensure heat dissipation when the original vehicle cooling fan is fully engaged, the air conditioner exits the high pressure protection state; When the low pressure of the refrigerant inside the air conditioner is lower than the second pressure threshold of the air conditioning system's icing protection, the air conditioner enters the low pressure protection state; when the low pressure of the refrigerant inside the air conditioner is higher than the second pressure threshold of the air conditioning system's icing protection, the air conditioner exits the low pressure protection state; When the high pressure of the refrigerant inside the air conditioner is higher than the third pressure threshold of the stable operation of the air conditioning system, but is still within the range where the original vehicle's cooling fan is fully engaged to ensure heat dissipation, the air conditioner enters the medium pressure protection state; when the high pressure of the refrigerant inside the air conditioner reaches the fourth pressure threshold of the air conditioning system charge calibration test, the air conditioner exits the medium pressure protection state.

2. A commercial vehicle air conditioning system pressure protection method according to claim 1, characterized in that: The method further comprises: Set the air conditioning medium pressure protection exit pressure P0, air conditioning medium pressure protection pressure P1, air conditioning high pressure protection exit pressure P2, air conditioning high pressure protection pressure P3, air conditioning low pressure protection exit pressure P4, and air conditioning low pressure protection pressure P5, air conditioning system high pressure P h ; When P1<P h <P2, the air conditioner enters the medium pressure protection state; when P h When P<P0, the air conditioner exits the medium pressure protection state; when P h >P3, the air conditioner enters high pressure protection state; when P h <P2, the air conditioner exits the high pressure protection state; when P l <P5, the air conditioner enters low pressure protection state; when P l >P4, the air conditioner exits the low-pressure protection state.

3. A commercial vehicle air conditioning system pressure protection method according to claim 1, characterized in that: The method further comprises: When the air conditioner enters the high-voltage protection state, the original car air conditioner will not start; when the air conditioner exits the high-voltage protection state, the original car air conditioner is allowed to start; When the air conditioner enters the low-voltage protection state, the original car air conditioner will not start; when the air conditioner exits the low-voltage protection state, the original car air conditioner is allowed to start; When the air conditioner enters the medium-voltage protection state, the original vehicle cooling fan is fully engaged; when the air conditioner exits the medium-voltage protection state, the original vehicle cooling fan returns to the state required by the cooling system.

4. A commercial vehicle air conditioning system pressure protection method according to claim 2, characterized in that: The method further comprises: When P0≤P h ≤P1, the air conditioner maintains the medium voltage protection state; When P2≤P h ≤P0, the air conditioner maintains high pressure protection state; When P5≤P l ≤P4, the air conditioner maintains low pressure protection status.

5. A commercial vehicle air conditioning system pressure protection method according to claim 2, characterized in that: For the air conditioner high pressure protection, the value of the pressure protection pressure P3 is determined by the lowest withstand pressure value of each component of the air conditioning system; the value of the air conditioner high pressure protection exit pressure P2 is determined by the refrigerant phase change temperature T2 inside the condenser when the high pressure protection is no longer needed; among them, the refrigerant phase change temperature of the air conditioner condenser in stable operation when the original vehicle cooling fan is fully engaged and the test environment temperature T t The difference is ΔT2, then T2 is the instantaneous maximum ambient temperature T of the area where the air-conditioning user's car is located. h and ΔT2, that is, T2 = T h +ΔT2; P2 is the phase change pressure when the refrigerant temperature of the commercial vehicle air conditioner is T2 minus the pressure fluctuation value P w .

6. A commercial vehicle air conditioning system pressure protection method according to claim 2, characterized in that: For air conditioner low pressure protection: the value of air conditioner low pressure protection pressure P5 is determined by the set temperature T5 of ice protection; P5 is the phase change pressure when the refrigerant temperature of the commercial vehicle air conditioner is T5; the low pressure protection exit pressure P4 is determined by the exit temperature T4 of ice protection, and T4 is the product of T5 and temperature fluctuation value T w The sum of T4 = T5 + T w ; P4 is the phase change pressure when the refrigerant temperature actually used by the commercial vehicle air conditioner is T4.

7. A commercial vehicle air conditioning system pressure protection method according to claim 2, characterized in that: For air conditioner medium pressure protection: the value of medium pressure protection pressure P1 is determined by the refrigerant phase change temperature T1 inside the condenser when medium pressure protection is required; define the refrigerant phase change temperature of the air conditioner condenser in stable operation when the original vehicle cooling fan is not engaged and the test environment temperature T t The difference is ΔT1, then T1 is T h The sum of ΔT1, that is, T1 = T h +ΔT1; P1 is the phase change pressure when the refrigerant temperature of the commercial vehicle air conditioner is T1; the medium pressure protection exit pressure P0 is the high pressure value P of the commercial vehicle air conditioner system in stable operation n and pressure fluctuation value P w The sum of P0 = P n +P w ;P n That is, the high pressure value when the commercial vehicle air conditioner is operating within the standard charging amount range and charging temperature.

8. A pressure protection device for a commercial vehicle air conditioning system, characterized in that: The device comprises: A control module, used to control the air conditioner to enter or exit an air conditioner protection state based on a preset air conditioner pressure protection logic; wherein the air conditioner protection state includes a high pressure protection state, a low pressure protection state and a medium pressure protection state; The high-pressure protection module is used to enter the high-pressure protection state when the high pressure of the refrigerant inside the air conditioner is higher than the first pressure threshold tolerated by the air-conditioning system components; the air conditioner exits the high-pressure protection state when the high pressure of the refrigerant inside the air conditioner is within the range that can ensure heat dissipation when the original vehicle cooling fan is fully engaged; The low-pressure protection module is used to make the air conditioner enter the low-pressure protection state when the low pressure of the refrigerant inside the air conditioner is lower than the second pressure threshold of the air conditioner system ice protection; when the low pressure of the refrigerant inside the air conditioner is higher than the second pressure threshold of the air conditioner system ice protection, the air conditioner exits the low-pressure protection state; The medium-pressure protection module is used to prevent the air conditioner from entering the medium-pressure protection state when the high pressure of the refrigerant inside the air conditioner is higher than the third pressure threshold of the stable operation of the air-conditioning system, but is still within the range where the original vehicle cooling fan is fully engaged to ensure heat dissipation; and when the high pressure of the refrigerant inside the air conditioner reaches the fourth pressure threshold of the air-conditioning system charge calibration test, the air conditioner exits the medium-pressure protection state.

9. A pressure protection device for a commercial vehicle air conditioning system, characterized in that: The device comprises: at least one processor; and, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can complete the commercial vehicle air conditioning system pressure protection method described in any one of claims 1-7.

10. A non-volatile computer storage medium for pressure protection of a commercial vehicle air conditioning system, storing computer executable instructions, characterized in that: The computer executable instructions are executed by a processor to implement a commercial vehicle air conditioning system pressure protection method as described in any one of claims 1 to 7.

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